Belkin PureAV Hybrid AVU1500 UPS with PureFilter Technology (Discontinued by Manufacturer) Phase 4 PureFilter Technology isolates and eliminates AC line noise Uninterruptible Power Supply provides backup power to DVRs, Media Center PCs, or any other devices for which you want to preserve system settings Automatic Voltage Regulation maintains constant voltage by increasing low voltage and decreasing high voltage without the aid of the battery Unique IR Blaster allows projectors or projection TVs to cool their lamps, preventing damage from excessive heat before shutting down SmartStageTM Shutdown Technology shuts down your equipment in stages, prolonging battery life and reserving power for the most critical devices